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Finding the Fourth Proportional to 122.21, 183.26 and 81.61

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Solution

The fourth proportional to 122.21, 183.26 and 81.61 is: 122.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.21 : 183.26 = 81.61 : x
  2. Step 2: Convert to fraction form
    122.21/183.26 = 81.61/x
  3. Step 3: Cross multiply
    122.21x = 183.26 × 81.61
  4. Step 4: Simplify right side
    122.21x = 14,955.44
  5. Step 5: Solve for x
    x = 14,955.44/122.21
  6. Step 6: Final answer
    x = 122.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.